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Agrobacteria-Rhizobia Complex

About

Agrobacteria-rhizobia complex (ARC) is a diverse group of plant-associated bacteria in the family Rhizobiaceae. This website is created to provide curated information about these bacteria.
Names (https://doi.org/10.1099/ijsem.0.003426)
- Agrobacteria
  - Bacteria that cause (or potentially may cause) crown gall or hairy root disease
  - Have (or can have) tumor-inducing plasmids (pTi)
  - A polyphyletic and heterogeneous group that include many species belonging to several different genera (e.g., Agrobacterium, Allorhizobium, Rhizobium)
- Rhizobia
  - Bacteria that induce nodule formation on a legume host and perform nitrogen fixation

Biovars
- BV1: the Agrobacterium tumefaciens species complex, divided into multiple genomnospecies (G?), some have Latin names:

Genomnospecies	Species Name	Representative Strains	Note
G1	Agrobacterium fabacearum	Ach5, 1D1108	LPSN

G2: Agrobacterium pusense (Rhizobium pusense in NCBI); CFBP 5875.
G3: Agrobacterium tomkonis
G4: Agrobacterium radiobacter; 1D1460
G7: Agrobacterium deltaense; 1D1609
G8: Agrobacterium fabrum; C58
G9: Agrobacterium salinitolerans
G14: Agrobacterium nepotum
G15: Agrobacterium viscosum
G19: Agrobacterium burrii; https://doi.org/10.1094/PHYTO-11-21-0463-SC
G20: Agrobacterium shirazense; https://doi.org/10.1094/PHYTO-11-21-0463-SC
Agrobacterium arsenijevicii; no genomnospecies assignment, sister of Agrobacterium nepotum; https://doi.org/10.1016/j.syapm.2015.06.001
Agrobacterium leguminum; no genomnospecies assignment, sister of Agrobacterium deltaense; https://doi.org/10.1099/ijsem.0.005120
BV1-like: sister group of BV1
Agrobacterium bohemicum
Agrobacterium larrymoorei
Agrobacterium rosae
Agrobacterium rubi
Agrobacterium skierniewicense
Agrobacterium vaccinii
BV2: current name = Rhizobium rhizogenes
BV3: previously Agrobacterium vitis, now Allorhizobium spp. Narrow host range, limited to grapevine.
Genus names
Agrobacterium: 1 circular chromosome (~2.9 Mb) + 1 linear chromid (~2.2 Mb); BV1 & BV1-like. The linear chromid is a specific trait.
Allorhizobium: 1 circular chromosome (~3.7 Mb) + 1 circular chromid (~1.3 Mb); BV3
Rhizobium: 1 circular chromosome (~3.8-4.8 Mb) + 1 or more circular chromids; BV2, BV2-like, diverse rhizobia

Jeff H. Chang; Department of Botany and Plant Pathology, Oregon State University, USA
Chih-Horng Kuo (site manager); Institute of Plant and Microbial Biology, Academia Sinica, Taiwan
Erh-Min Lai; Institute of Plant and Microbial Biology, Academia Sinica, Taiwan
Alexandra J. Weisberg; Department of Botany and Plant Pathology, Oregon State University, USA